"But... How are you alive?! I saw, you were stabbed in the gut with a lightsaber!"
"It's not too hard to live through a lightsaber stab, it cauterizes the wounds as it inflicts them. It is just incredibly painful. Here, let me show you!"
Done. Literally one line of dialogue, now you can re-use your villain who was "killed".
How to resolve that plot-hole:
"But... How are you alive?! I saw, you were stabbed in the gut with a lightsaber!"
"It's not too hard to live through a lightsaber stab, it cauterizes the wounds as it inflicts them. It is just incredibly painful. Here, let me show you!"
Done. Literally one line of dialogue, now you can re-use your villain who was "killed".